| Effect of water and nitrogen coupling on maize in salinity soil of the Hetao irrigation area |
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| DOI：10.7606/j.issn.1000-7601.2020.04.13 |
| Key Words: soil salinization maize irrigation amount fertilizing amount water and nitrogen coupling production |
| Author Name | Affiliation | | YAN Jianwen | College of Water Conservancy and Civil Engineering, Inner Mongolian Agricultural University, Hohhot, Inner Mongolia 010018，China
Engineering Research Center of High\|Efficiency Water\|Saving Technology Equipment and Water and Soil Environment Effects in Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia 010018, China | | SHI Haibin | College of Water Conservancy and Civil Engineering, Inner Mongolian Agricultural University, Hohhot, Inner Mongolia 010018，China
Engineering Research Center of High\|Efficiency Water\|Saving Technology Equipment and Water and Soil Environment Effects in Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia 010018, China | | LI Xianyue | College of Water Conservancy and Civil Engineering, Inner Mongolian Agricultural University, Hohhot, Inner Mongolia 010018，China
Engineering Research Center of High\|Efficiency Water\|Saving Technology Equipment and Water and Soil Environment Effects in Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia 010018, China | | TIAN Delong | Hydroelectric and Water Conservancy Science Institute， China’s Scientific Research Institute in the Pastoral Areas of Water Conservancy, Hohhot, Inner Mongolia 010020, China | | LI Zhen | College of Water Conservancy and Civil Engineering, Inner Mongolian Agricultural University, Hohhot, Inner Mongolia 010018，China
Engineering Research Center of High\|Efficiency Water\|Saving Technology Equipment and Water and Soil Environment Effects in Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia 010018, China |
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| Abstract: |
| In order to explore an optimized mode of saving water and fertilizer, suitable for salinized areas, this paper selected maize as the research object a field experiments. The experiment had 10 treatments including different water and fertilizer combination in light and moderate saline soils. Regression model between maize yield and irrigation amount and nitrogen (N) amount was developed in different saline soils. The results showed that water and N had increased yield in slight and moderate saline soils. The interactions of water and N had positive effects. Also, the effect of water was more important than that of nitrogen. Through the analysis of marginal effect, the rate difference of increasing yield of N was not significant in slight and moderate saline soil. Water increased yield more efficiently in slight saline soil than that in moderate saline soil. The maximum yields in slight and moderate saline soils were 13 581 kg·hm-2 and 11 115 kg·hm-2, respectively. The irrigation number was 0.77 (the irrigation amount in whole period of growth was 2 250 m3·hm-2). The N number was 0.69 (the total N amount was 225 kg·hm-2). It showed that salt stress decreased the maize yield with the same irrigation and N amount. Through the model optimization, the best model of water and N in slight and moderate saline soils was the same. The irrigation amount in whole period of growth was 1 900.95~2 389.08 m3·hm-2. The total N amount was 174.04~240.7 kg·hm-2. Compared with the local irrigation amount (2 925 m3·hm-2) and N amount (325 kg·hm-2), the optimized model saved 18.2%~35% water. It also saved 26.0%~46.4% of N. The optimized scope contained the irrigation and N amount of the highest yield in slight and moderate saline soils. The yield was consistent with the local yield. However, from the view of maintaining maize yield and improving saline\|alkali soil for a long\|term, the above\|moderate irrigation amount and below\|moderate fertilizer amount were recommended as the optimized scope for the moderate saline soil. The measures were taken to decrease the background value of soil salinity radically and increase the yield in a long\|term. It was advised to select moderate amount of irrigation and N in slight saline soil. |
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